3SCRUBY C B. Some applications of laser ultrasound[J].Ultrasonics, 1989, 27:195-209.
4JIANFENG X U, JIANRONG ZHANG. Ultrasonic velocity and attenuation in nanostrucmed Zn materials[J].Materials Letters, 1996, 29(10) :131-136.
5DU Y L, MU B M, ZHANG X R. The ultrasonic longitudinal velocities of nanostructured NiAI alloys [J ].Progress in Natural Science, 1996, 6 (Suppl) : S394-S397.
6SCRUBY C B. Some applications of laser ultrasound[J ].Ultrasonics, 1989, 27:195-209.?A
7JIANFENG X U, JIANRONG ZHANG. Ultrasonic velocity and attenuation in nanostructued Zn materials[J].Materials Letters, 1996, 29(10): 131-136.?A
8DU Y L, MU B M, ZHANG X R. The ultrasonic longitudinal velocities of nanostructured NiAl alloys [ J ].Progress in Natural Science, 1996, 6 (Suppl): S394-S397.?A
